Changes:
Replacement of non-FOSS, untrustworthy or suspicious binaries or source code:

Do location sharing with OpenStreetMap(osmdroid) instead of Google Maps
Use Noto emoji set instead of Apple's emoji
Google Play Services GCM replaced with Telegram's push service
Has to show a notification on Oreo+, ask Google
SECURITY: BoringSSL prebuilts are replaced with recent upstream source code built at compile time
SECURITY: FFmpeg prebuilts are replaced with recent upstream source code built at compi